Cap assembly for a medicament delivery device

ABSTRACT

The present disclosure relates to a cap assembly (5) for a medicament delivery device, comprising: a cap (7) having a tubular body (7b) defining an axially extending distal opening (7c) and configured to be mounted to a proximal end of a medicament delivery device, wherein the cap (7) has a bottom structure (7e) defining a proximal end of the distal opening (7c), wherein the bottom structure (7e) has a cam structure (7f) provided inside the tubular body (7b), and wherein the tubular body (7b) has inner walls provided with radial recesses (7d), and an elongated squeeze member (9) configured to be received in the distal opening (7c) of the tubular body (7b), and having a longitudinally extending channel (9d) configured to receive a delivery member shield, and which squeeze member (9) has radial arms (9e) flexible in the radial direction and forming part of a wall of the channel (9d), wherein the squeeze member (9) has a proximal end face (9a) configured to cooperate with the cam structure (7f) of the cap (7), whereby axial displacement of the squeeze member (9) from a first position in which the proximal end face (9a) bears against the cam structure (7f) to a second position in which the squeeze member (9) is received further by the cap (7) causes rotation of the squeeze member (9) relative to the cap (7), wherein the radial arms (9e) are configured to engage with a respective radial recess (7d) of the tubular body (7b) in the first position of the squeeze member (9), and wherein the radial arms (9e) are configured to disengage from the respective radial recess when the squeeze member (9) is displaced from the first position to the second position and rotated, whereby the flexible radial arms (9e) are pressed into the channel (9d) by the inner walls of the tubular body (7b), reducing a cross-sectional area of the channel (9d).

TECHNICAL FIELD

The present disclosure generally relates to medical devices. In particular, it relates to a cap assembly for a medicament delivery device, to a medicament delivery device comprising such a cap assembly, and to a method of assembling a sub-assembly for a medicament delivery device.

BACKGROUND

Medicament delivery devices, such as injectors and inhalers, typically comprise a housing in which a medicament container containing a medicament is to be arranged. Upon activation of the medicament delivery device, the medicament is expelled through a medicament delivery member, for example a needle or a nozzle.

In order to protect and to keep the medicament delivery member sterile, the medicament delivery member may be provided with a delivery member shield, or sheath, such as a Flexible Needle Shield (FNS) or a Rigid Needle Shield (RNS). The delivery member shield may thus be attached to the medicament container to cover the medicament delivery member, during assembly of the medicament container or of the medicament delivery device.

Moreover, the medicament delivery device may comprise a removable cap which is mounted to the proximal end of the housing, i.e. that end which is placed towards the injection site during medicament delivery, of the medicament delivery device, or to the proximal end of the medicament container. The removable cap has the function of providing mechanical protection of the medicament delivery member while attached to the housing or medicament container, and to remove the delivery member shield when the cap is removed from the housing.

WO2015110532 A1 discloses an auto-injector having a connector for connecting a needle cover to a removable cap. The connector has a plurality of legs spaced symmetrically away from one another about a central hub. The legs have an elastic nature and aid in securing the needle cover and/or rigid needle shield to a cap insert and hence to the removable cap. The needle cover and/or needle shield are secured together through upper, internally facing barbs protruding from the first legs. The upper, internally facing barbs include tips that point toward the forward end of the connector. These barbs are shaped to engage the needle cover and/or rigid needle shield when the needle cover and/or rigid needle shield is fitted within the connector. The barb tips apply opposing force with respect to one another when they engage the needle cover and/or rigid needle shield when the needle cover and/or rigid needle shield is fitted within the connector.

SUMMARY

According to the design disclosed in WO2015110532 A1, the legs of the connector are flexed towards each other as soon as the connector is placed in the cap insert. This bending of the legs renders it more difficult to insert the needle cover/rigid needle shield into the connector, thereby making assembly more difficult.

In view of the above, a general object of the present disclosure is to provide a cap assembly for a medicament delivery device which solves or at least mitigates the problems of the prior art.

There is hence according to a first aspect of the present disclosure provided a cap assembly for a medicament delivery device, comprising: a cap having a tubular body defining an axially extending distal opening and configured to be mounted to a proximal end of a medicament delivery device, wherein the cap has a bottom structure defining a proximal end of the distal opening, wherein the bottom structure has a cam structure provided inside the tubular body, and wherein the tubular body has inner walls provided with radial recesses extending in the longitudinal direction along the inner walls, and an elongated squeeze member configured to be received in the distal opening of the tubular body, and having a longitudinally extending channel configured to receive a delivery member shield, and which squeeze member has radial arms flexible in the radial direction and forming part of a wall of the channel, wherein the squeeze member has a proximal end face configured to cooperate with the cam structure of the cap, whereby axial displacement of the squeeze member from a first position in which the proximal end face bears against the cam structure to a second position in which the squeeze member is received further by the cap causes rotation of the squeeze member relative to the cap, wherein the radial arms are configured to engage with a respective radial recess of the tubular body in the first position of the squeeze member, and wherein the radial arms are configured to disengage from the respective radial recess when the squeeze member is displaced from the first position to the second position and rotated, whereby the flexible radial arms are pressed into the channel by the inner walls of the tubular body, reducing a cross-sectional area of the channel.

The squeeze member is thus able to provide radial pressure on, or squeeze, a delivery member shield when a delivery member shield is inserted into the channel of the squeeze member and the squeeze member is moved proximally inside the distal opening of the cap, to the second position. The cap may hence in a simple manner be mounted to the delivery member shield, and removed from a medicament container when the cap assembly is removed from a medicament delivery device.

According to one embodiment the cam structure is annular in a radial plane and comprises a plurality of elevated portions with a cut-out having oppositely inclined surfaces provided between each adjacent pair of elevated portions, in the circumferential direction of the cam structure.

According to one embodiment the proximal end face of the squeeze member comprises a plurality of elevated portion with a cut-out having oppositely inclined surfaces provided between each adjacent pair of elevated portions of the proximal end face, in the circumferential direction of the squeeze member.

According to one embodiment each elevated portion of the squeeze member is configured to bear against a region of a cut-out of the cam structure closer to an elevated portion of the cam structure than to a lowest elevational point of the cut-out, in the first position of the squeeze member.

According to one embodiment the elevated portions of the squeeze member are configured to engage with the cut-outs of the cam structure in the second position of the squeeze member.

According to one embodiment at least two of the radial arms are arranged opposite to each other in a radial plane of the squeeze member, causing the two radial arms to move towards each other in the second position of the squeeze member.

According to one embodiment two of the radial arms are arranged in a first radial plane of the squeeze member, and wherein two other radial arms are arranged in a second radial plane axially spaced apart from the first radial plane.

According to one embodiment the two radial arms arranged in the first plane are arranged 90 degrees offset in the circumferential direction relative to the two arms arranged in the second plane.

According to one embodiment the radial recesses have inclined surfaces in the circumferential direction allowing the radial arms to disengage when the squeeze member is rotated while displaced from the first position to the second position.

According to one embodiment the radial arms have an increasing thickness in a direction from their point of attachment towards their end portions, wherein the thickness of each end portion is thicker than a wall thickness of the channel.

According to one embodiment the radial recesses extend in the longitudinal direction along a majority of the length of the inner walls of the tubular body.

There is according to a second aspect of the present disclosure provided a medicament delivery device comprising: a body having a proximal opening, and a cap assembly according to the first aspect, wherein the cap assembly is configured to be mounted to the medicament delivery device to cover the proximal opening of the body.

One embodiment comprises a surface configured to bear against a distal end face of the squeeze member.

There is according to a third aspect provided a method of assembling a sub-assembly for a medicament delivery device, comprising: a) providing a cap assembly according to the first aspect, b) inserting the squeeze member into the distal opening of the cap and moving the squeeze member towards the bottom structure until the proximal end face of the squeeze member contacts the cam structure to obtain the first position of the squeeze member, and c) assembling the cap with the squeeze member arranged therein with a medicament container assembly comprising a delivery member shield, such that the squeeze member receives the delivery member shield.

According to one embodiment step c) includes moving a distal end face of the squeeze member towards a proximal surface of the medicament container assembly, causing the squeeze member to move proximally inside the cap from the first position to the second position causing the radial arms to squeeze the delivery member shield.

According to one embodiment the delivery member shield is a rigid needle shield or a flexible needle shield.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to “a/an/the element, apparatus, component, means, etc. are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, etc., unless explicitly stated otherwise.

BRIEF DESCRIPTION OF THE DRAWINGS

The specific embodiments of the inventive concept will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of an example of a medicament delivery device without an activation assembly;

FIG. 2 shows an exploded view of the medicament delivery device in FIG. 1;

FIG. 3 shows an example of a cap assembly;

FIG. 4 is a top view of a cap;

FIG. 5 is a longitudinal section of the cap in FIG. 4;

FIG. 6 shows the squeeze member arranged in the cap in a first position of the squeeze member;

FIG. 7 is a top view of the cap assembly shown in FIG. 6;

FIG. 8 is a longitudinal section of the squeeze member arranged in the cap in a second position of the squeeze member;

FIG. 9 is a top view of the cap assembly shown in FIG. 8;

FIG. 10 shows a perspective view of an example of a medicament container assembly;

FIG. 11 shows a longitudinal section of a proximal portion of an elongated body of the medicament container assembly;

FIG. 12 shows a longitudinal section of a sub-assembly comprising the cap assembly and the medicament container assembly during assembly;

FIG. 13 shows a longitudinal section of the sub-assembly in FIG. 12 when the cap assembly and the medicament container assembly have been assembled;

FIG. 14 is a flowchart showing a method of assembling a sub-assembly including the cap assembly and the medicament container assembly; and

FIG. 15 is a flowchart showing a method of assembling a sub-assembly including the cap assembly and the medicament container assembly.

DETAILED DESCRIPTION

The inventive concept will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplifying embodiments are shown. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. Like numbers refer to like elements throughout the description.

The term “proximal end” as used herein, when used in conjunction with a cap assembly, refers to that end of the cap assembly which is farthest from the proximal end of the medicament delivery device, when the cap assembly is properly mounted onto a medicament delivery device. The proximal end of a medicament delivery device is that end which is to be pointed towards the injection site during medicament injection. The same considerations also apply when referring to any component of the cap assembly. The “distal end” is the opposite end relative to the proximal end. With “proximal direction” and, equivalently, “proximally” is meant a direction from the distal end towards the proximal end, along the central axis of the safety mechanism. With “distal direction” or “distally” is meant the opposite direction to “proximal direction”. The same definition also applies for the medicament container and any component thereof.

The present disclosure relates to a cap assembly for a medicament delivery device. The cap assembly includes a cap and an elongated squeeze member. The cap is configured to be mounted to a proximal end of a medicament delivery device, for example to the housing, or body, of a medicament delivery device. The cap has a tubular body which has a distal opening extending along the central axis of the tubular body.

The tubular body has a bottom structure which defines the proximal end wall of the distal opening. The bottom structure has a cam structure, provided inside the tubular body, in particular inside the distal opening. The tubular body has inner walls, i.e. the inner walls of the distal opening provided with radial recesses.

The squeeze member is configured to be received by the tubular body, in particular in the distal opening. The squeeze member has a longitudinally extending channel configured to receive a delivery member shield. The squeeze member furthermore has radial arms that are flexible in the radial direction. The radial arms form part of a channel wall(s). The squeeze member furthermore has a proximal end face configured to cooperate with the cam structure of the cap. The squeeze member is configured to be axially displaceable from a first position in which the proximal end face bears against the cam structure to a second position in which the squeeze member is received further by the cap. This axial displacement causes rotation of the squeeze member relative to the cap, and is obtained due to the cooperating proximal end face of the squeeze member and the cam structure of the cap.

The radial arms extend radially outside the outer surface of the squeeze member when the squeeze member is arranged in the first position. In the first position, each radial arm is received by a respective radial recess of the tubular body. When the squeeze member is rotated, the radial arms disengage from the radial recesses, and as the squeeze member rotates so that the radial arms are moved in the circumferential direction away from their respective radial recess, the radial arms are pressed radially inwards by the inner walls of the tubular body. This causes the radial arms to extend radially inwards of the inner surface of the channel of the squeeze member, reducing a cross-sectional area of the channel. The radial arms may thereby provide radial pressure onto a delivery member shield received by the squeeze member. The cap assembly can thus engage with the delivery member shield such that when the cap assembly is removed from a medicament delivery device, the delivery member shield is removed simultaneously.

With reference to FIGS. 1-10 an example of a cap assembly will be described.

FIG. 1 shows a perspective view of a medicament delivery device 1, which in the present case may also be seen as a sub-assembly of a medicament delivery device, because the depicted example does not comprise an activation assembly, which is to be mounted to a distal end of the medicament delivery device 1.

The exemplified medicament delivery device 1 shown in FIG. 1 has a proximal end is and a distal end 1 b, and comprises a body, or housing, 3, and a cap assembly 5.

Turning now to FIG. 2, an exploded view of the medicament delivery device 1 is shown. The medicament delivery device 1 comprises the cap assembly 5, which comprises a cap 7 and a squeeze member 9, a medicament container assembly 11, which comprises the body 3 and a clamp member 13. The medicament delivery device 1 may further include a delivery member shield 15 and a medicament container 17 including a delivery member 19.

According to the example shown in FIG. 2, the medicament container 17 is a syringe and the delivery member 19 is a needle. Moreover, the exemplified the delivery member shield 15 includes a flexible inner member 15 a configured to receive the delivery member 19 and a rigid outer member 15 b configured to receive the flexible inner member 15 a. The rigid outer member 15 b has chamfered outer surfaces 15 c extending parallel with each other in the longitudinal direction of the delivery member shield 15. The exemplified delivery member shield 15 is a rigid needle shield, but could alternatively be a flexible needle shield.

FIG. 3 shows a detailed view of the cap assembly 5. The exemplified cap 7 has an outer body 7 a and an inner tubular body 7 b, coaxially arranged with the outer body. The tubular body 7 b has an axially extending distal opening 7 c. The tubular body 7 b is configured to receive the squeeze member 9 in the distal opening 7 c.

The tubular body 7 b has a plurality of radial recesses 7 d. The radial recesses 7 d extend in the longitudinal direction along a majority of the axial length of the tubular body 7 b, and thus of the distal opening 7 c.

The squeeze member 9 is elongated and has a tubular shape. The squeeze member 9 has a channel 9 d extending in the longitudinal direction through the squeeze member 9, configured to receive the delivery member shield 15.

The squeeze member 9 furthermore has a proximal end face 9 a comprising a plurality of elevated portions 9 b. Between each pair of adjacent pair of elevated portions 9 b is a cut-out 9 c with oppositely inclined or sloping surfaces. The proximal end face 9 a is hence provided with a plurality of teeth in the circumferential direction of the squeeze member 9, with a gradually increasing and decreasing elevation.

The squeeze member 9 comprises a plurality of radial arms 9 d which are flexible in the radial direction. The radial arms 9 d extend the circumferential direction from the main body of the squeeze member 9 and have an increasing thickness towards their end portions relative to the point of attachment to the main body of the squeeze member 9. Hereto, the end thickness of each radial arm is substantially thicker than the thickness of the channel wall.

The radial arms 9 e form part of the channel wall. The radial arms 9 e are by default configured to flex radially outwards from the outer surface of the squeeze member 9, as shown in FIG. 3. Hereto, the radial arms 9 e protrude radially from the outer surface of the main body of the squeeze member 9 when no external force is applied to the radial arms 9 e. The radial arms 9 e are configured to slide axially in a respective radial recess 7 d of the cap 7, when the squeeze member 9 is moved linearly in the distal opening 7 c of the tubular body 7 b. The radial recess 7 d have inclined surfaces in the circumferential direction, allowing the radial arms 9 e to disengage from the radial recesses 7 d when the squeeze member 9 is rotated while being displaced in the distal opening 7 c, from a first position to a second position. The radial recesses 7 d and the radial arms 9 e may be seen to form a ratchet configuration, with the radial arms 9 e being flexible radially inwards when the squeeze member 9 disengage from the radial recesses 7 d and the squeeze member 9 is being rotated.

According to the example shown in FIG. 3, the squeeze member 9 has a plurality of arms 9 e in a first radial plane along the axial direction of the squeeze member 9, and a plurality of radial arms 9 e in a second plane axially spaced apart from the first plane. The exemplified squeeze member 9 hence has several layers of radial arms 9 e, in the axial direction of the squeeze member 9.

FIG. 4 shows a top view of the cap 7, in particular seen from the distal end of the cap 7. The cap 7 has a bottom structure 7 e, which defines a distal end wall or surface of the distal opening 7 c. The bottom structure 7 e has a cam structure 7 f, which according to the present example is annular in a radial plane. The cam structure 7 f is configured to cooperate with the proximal end face 9 a of the squeeze member 9.

FIG. 5 shows a longitudinal section of the cap 7. The cam structure 7 f has a plurality of slanting surfaces, forming a gradually increasing and decreasing teeth-like structure in the circumferential direction. Hereto, the cam structure 7 f has a plurality of elevated portions 7 g, of which one can be seen in FIG. 5, and cut-outs 7 h with oppositely arranged inclined surfaces. Between each pair of adjacent elevated portion 7 g, there is provided a cut-out 7 h. This configuration of the cam structure 7 f allows for cooperation with the corresponding structure of the proximal end face 9 a of the squeeze member 9, as will be described in more detail in the following.

FIG. 6 shows the squeeze member 9 arranged inside the tubular body 7 b of the cap 7. The squeeze member 9 is arranged in a first position relative to the cap 7. Here, the proximal end face 9 a of the squeeze member 9 bears against the cam structure 7 f arranged inside the tubular body 7 b. Each elevated portion 9 b of the squeeze member 9 bears against a respective top portion of the cut-out 7 h, closer to an elevated portion of the cam structure 7 f than to the lowest elevational point of the cut-out 7 h.

As shown in the top view of FIG. 7, each radial arm 9 e of the squeeze member 9 is arranged in a respective radial recess 7 d of the inner walls of the tubular body 7 b when the squeeze member 9 is in the first position.

FIG. 8 shows the squeeze member 9 in a second position. In the second position, the squeeze member 9 has been axially displaced relative to the first position shown in FIG. 6. In particular, the squeeze member 9 has been further received by the tubular body 7 b. Due to this proximal displacement of the squeeze member 9 the proximal end face 9 a and the cam structure 7 f have cooperated, causing the squeeze member 9 to rotate relative to the cap 7. Hereto, the elevated portions 9 b of the proximal end face 9 a have slid down to the lowest elevational points of the cut-outs 7 h of the cam structure 7 f. Moreover, the elevated portions 7 g of the cam structure 7 f have been fully received by the cut-out 9 c of the proximal end face 9 a of the squeeze member 9.

In FIG. 9, a top view of the situation shown in FIG. 8 is depicted. The radial arms 9 e have disengaged from the radial recesses 7 d as the squeeze member 9 is moved proximally from the first position to the second position, causing the squeeze member 9 to rotate, as indicated by the arrows showing rotation. This causes the radial arms 9 e to bear against the inner walls of the tubular body 7 b, outside the radial recesses 7 d, which are radially closer to the central axis of the tubular body 7 b. The radial arms 9 e are therefore pressed or flexed radially inwards. The radial arms 9 e have end portions that are thicker than the wall thickness of the channel 9 d, and therefore, the radial arms 9 e are pressed into the channel 9 d, reducing the cross-sectional area of the channel 9 d. When the delivery member shield 15 is arranged in the channel 9 d, the radial arms 9 e will engage with, or press against, the outer surface of the delivery member shield 9 d.

FIG. 10 shows the medicament container assembly 11. It should be noted that other medicament container assemblies than the one described herebelow may be used in conjunction with the cap assembly 5 previously described. Similarly, the below described medicament container assembly 11 may be used in conjunction with other cap assemblies than the exemplified cap assembly 5.

The exemplified medicament container assembly 11 includes the body 3 and the clamp member 13.

The clamp member 13 is tubular and has a through-opening 13 a extending in the longitudinal direction of the clamp member 13. The clamp member 13 furthermore has a proximal end flange 13, or support surface, extending radially inwards.

The body 3 has an elongated shape and is configured to receive the medicament container 17. The body 3 has a proximal end 3 a and a distal end 3 b and a support structure 3 c arranged inside the body 3, closer to the proximal end 3 a than to the distal end 3 b. The support structure 3 c extends between opposite inner surfaces of the body 3. The support structure 3 c is provided on, or attached to, the opposite inner surfaces of the body 3. The support structure 3 c has a central tubular portion 3 d provided with an axially extending through-opening 3 e configured to receive the medicament container 17.

As shown in FIG. 11, the body 3 furthermore has a radially flexible first gripper arm 3 f and a radially flexible second gripper arm 3 g arranged opposite relative to the first gripper arm 3 f. The first gripper arm 3 f and the second gripper arm 3 g extend in the axial direction of the body 3.

The first gripper arm 3 f and the second gripper arm 3 g are configured to support a neck portion of the medicament container 17. According to the example shown in FIG. 11, the first gripper arm 3 f and the second gripper arm 3 g form part of the tubular portion 3 d.

The first gripper arm 3 f has a gripper portion 3 h provided at a distal end of the first gripper arm 3 f, extending radially inwards. The second gripper arm 3 g has a gripper portion 3 i provided at a distal end of the second gripper arm 3 g, extending radially inwards.

The clamp member 13 is configured to receive the tubular portion 3 d of the body 3. In particular, the clamp member 13 is configured to be brought around the tubular portion 3 d from the proximal end 3 a of the body 3, and moved around the tubular portion 3 d such that the first gripper arm 3 f and the second gripper arm 3 g are received by the clamp member 13 and pressed radially inwards by the inner surface of the clamp member 13. When the clamp member 13 has been set in its end position during assembly, the proximal end flange 13 b of the clamp member 13 bears against the proximal end of the tubular portion 3 d.

With reference to FIGS. 12-15 methods of assembling a sub-assembly will now be described.

FIG. 12 shows a longitudinal section of an example of a sub-assembly. Sub-assembly 21 includes the cap assembly 5 and the medicament container assembly 11. FIG. 12 shows the sub-assembly 21 during assembly. The squeeze member 9 is in the first position inside the tubular body 7 b of the cap 7, and the delivery member shield 15 is arranged in the channel of the squeeze member 9. The medicament container 17 has been arranged inside the body 3, and extends through the through-opening 3 e of the tubular portion 3 d, with a neck portion 17 a of the medicament container 17 extending proximally beyond the tubular portion 3 d. The delivery member 19 is arranged in the delivery member shield 15.

In FIG. 13, the sub-assembly 21 is shown in an assembled state. The distal end face of the squeeze member 9 was pushed towards the proximal end flange 13 b of the clamp member 13 as the cap assembly 5 and the medicament container assembly 11 were moved towards each other, causing the squeeze member 9 to move from the first position to the second position, and thereby rotate due to the cooperation between the cam structure 7 f of the cap 7 and the proximal end face 9 a of the squeeze member 9. The radial arms 9 e of the squeeze member 9 have thus moved radially inwards as they were pressed towards the inner walls of the tubular body 7 b, outside the radial recesses 7 d, causing the radial arms 9 e to engage with the delivery member shield 15.

FIG. 14 shows a flowchart of a method of assembling a sub-assembly, for example sub-assembly 21.

In a step a) the cap assembly 5 is provided.

In a step b), the squeeze member 9 is inserted into the distal opening 7 c of the tubular body 7 b of the cap 7. The squeeze member 9 is moved towards the bottom structure 7 e of the tubular body 7 b until the proximal end face 9 a of the squeeze member 9 contacts the bottom structure 7 e, with each elevated portion 9 b of the squeeze member 9 being arranged closer to an elevated portion 7 g of the cam structure 7 f than to the lowest elevational point of the corresponding cut-outs 7 h of the cap 7. The squeeze member 9 is thus set in the first position.

In a step c) the cap 7 with the squeeze member 9 arranged therein is assembled with a medicament container assembly, for example medicament container assembly 11, including the medicament container 17 and the delivery member shield 15.

In examples where the cap assembly 5 is assembled with the medicament container assembly 11, the distal end of the squeeze member 9 is pushed against the proximal end flange 13 b of the clamp member 13 provided around the support structure 3 c of the body 3 and is moved in the distal direction, causing the squeeze member 9 to move in the proximal direction from the first position to the second position. Hence, during the assembly in step c), the squeeze member 9 is pushed further into the cap 7, moving from the first position to the second position, causing the squeeze member 9 to rotate and grip the delivery member shield 15.

It should be noted that the cap assembly 5 could alternatively be assembled with another type of medicament container assembly, provided that the medicament container assembly has a support surface against which the distal end face of the squeeze member may be pushed during assembly, to move the squeeze member from the first position to the second position.

The medicament container assembly 11 may be assembled according to the method described by the flowchart in FIG. 15.

Hence, in a step A) the medicament container assembly 11 is provided.

In a step B) the medicament container 17 is inserted from a distal end opening of the body 3, with the delivery member 19 pointing in the proximal direction and the delivery member shield 15 being provided on the delivery member 19.

The medicament container 17 is moved in the proximal direction until the neck portion 17 a of the medicament container 17 moves past the distal ends of the first gripper arm 3 f and the second gripper arm 3 g, and the delivery member shield 15 extends proximally through a proximal opening of the body 3.

In a step C) the clamp member 13 is moved over the delivery member shield 15, and into the body 3 through the proximal opening thereof.

In a step D) the clamp member 13 is moved in the distal direction over the tubular portion 3 d, and thus over the first gripper arm 3 f and the second gripper arm 3 g. The first gripper arm 3 f and the second gripper arm 3 f are thereby bent or flexed radially inwards by the inner surface or wall of the clamp member 13.

In step D) the medicament container 17 may furthermore be pushed distally until the clamp member 13 reaches an end position, i.e. when the proximal end flange 13 b bears against the proximal end of the tubular portion 3 d, and the first gripper arm 3 f and the second gripper arm 3 g snap around the neck portion 17 a of the medicament container 17, thereby providing support of the neck portion 17 a.

In case that the cap assembly 5 is assembled with the exemplified medicament container assembly 11 the steps a)-c) and steps A)-D) are interconnected, in the sense that prior to step c) the medicament container assembly 11 has typically been assembled according to steps A-C, while step D) and step c) may be carried out simultaneously. Thus in step D) the clamp member 13 may be pushed distally by the squeeze member 9 and the medicament container 17 and delivery member shield 15 may be pushed distally by the cap 7, as the delivery member shield 15 is arranged in the squeeze member 9 and the cap 7 is moved distally towards the proximal end of the body 3.

The inventive concept has mainly been described above with reference to a few examples. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the inventive concept, as defined by the appended claims. 

The invention claimed is:
 1. A cap assembly for a medicament delivery device, comprising: a cap having a tubular body defining an axially extending distal opening and configured to be mounted to a proximal end of a medicament delivery device, wherein the cap has a bottom structure defining a proximal end of the distal opening, wherein the bottom structure has a cam structure provided inside the tubular body, and wherein the tubular body has inner walls provided with radial recesses, and an elongated squeeze member configured to be received in the distal opening of the tubular body, and having a longitudinally extending channel configured to receive a delivery member shield, and which squeeze member has radial arms flexible in the radial direction and forming part of a wall of the channel, wherein the squeeze member has a proximal end face configured to cooperate with the cam structure of the cap, whereby axial displacement of the squeeze member from a first position in which the proximal end face bears against the cam structure to a second position in which the squeeze member is received further by the cap causes rotation of the squeeze member relative to the cap, wherein the radial arms are configured to engage with a respective radial recess of the tubular body in the first position of the squeeze member, and wherein the radial arms are configured to disengage from the respective radial recess when the squeeze member is displaced from the first position to the second position and rotated, whereby the flexible radial arms are pressed into the channel by the inner walls of the tubular body, reducing a cross-sectional area of the channel.
 2. The cap assembly as claimed in claim 1, wherein the cam structure is annular in a radial plane and comprises a plurality of elevated portions with a cut-out having oppositely inclined surfaces provided between each adjacent pair of elevated portions, in the circumferential direction of the cam structure.
 3. The cap assembly as claimed in claim 1, wherein the proximal end face of the squeeze member comprises a plurality of elevated portion with a cut-out having oppositely inclined surfaces provided between each adjacent pair of elevated portions of the proximal end face, in the circumferential direction of the squeeze member.
 4. The cap assembly as claimed in claim 3, wherein each elevated portion of the squeeze member is configured to bear against a region of a cut-out of the cam structure closer to an elevated portion of the cam structure than to a lowest elevational point of the cut-out, in the first position of the squeeze member.
 5. The cap assembly as claimed in claim 3, wherein the elevated portions of the squeeze member are configured to engage with the cut-outs of the cam structure in the second position of the squeeze member.
 6. The cap assembly as claimed in claim 1, wherein at least two of the radial arms are arranged opposite to each other in a radial plane of the squeeze member, causing the two radial arms to move towards each other in the second position of the squeeze member.
 7. The cap assembly as claimed in claim 1, wherein two of the radial arms are arranged in a first radial plane of the squeeze member, and wherein two other radial arms are arranged in a second radial plane axially spaced apart from the first radial plane.
 8. The cap assembly as claimed in claim 7, wherein the two radial arms arranged in the first plane are arranged 90 degrees offset in the circumferential direction relative to the two arms arranged in the second plane.
 9. The cap assembly as claimed in claim 1, wherein the radial recesses have inclined surfaces in the circumferential direction allowing the radial arms to disengage when the squeeze member is rotated while displaced from the first position to the second position.
 10. The cap assembly as claimed in claim 1, wherein the radial arms have an increasing thickness in a direction from their point of attachment towards their end portions, wherein the thickness of each end portion is thicker than a wall thickness of the channel.
 11. The cap assembly as claimed in claim 1, wherein the radial recesses extend in the longitudinal direction along a majority of the length of the inner walls of the tubular body.
 12. A medicament delivery device comprising: a body having a proximal opening, and a cap assembly as claimed in claim 1, wherein the cap assembly is configured to be mounted to the medicament delivery device to cover the proximal opening of the body.
 13. The medicament delivery device as claimed in claim 12, comprising a surface configured to bear against a distal end face of the squeeze member.
 14. A method of assembling a sub-assembly for a medicament delivery device, comprising: a) providing a cap assembly as claimed in claim 1, b) inserting the squeeze member into the distal opening of the cap and moving the squeeze member towards the bottom structure until the proximal end face of the squeeze member contacts the cam structure to obtain the first position of the squeeze member, and c) assembling the cap with the squeeze member arranged therein with a medicament container assembly comprising a delivery member shield, such that the squeeze member receives the delivery member shield.
 15. The method as claimed in claim 14, wherein step c) includes moving a distal end face of the squeeze member towards a proximal surface of the medicament container assembly, causing the squeeze member to move proximally inside the cap from the first position to the second position causing the radial arms to squeeze the delivery member shield.
 16. The method as claimed in claim 14, wherein the delivery member shield is a rigid needle shield or a flexible needle shield. 